Effects of the climatic conditions of the southeastern Brazil on degradation the fibers of coir-geotextile: Evaluation of mechanical and structural properties

Marques, Antônio Luiz; Patrício, Pedro; Santos, Fábio Soares dos; Monteiro, Monisa Lopes; Urashima, Denise de Carvalho; Rodrigues, Carlos

doi:10.1016/j.geotexmem.2013.07.004

Cited by 42 publications

(21 citation statements)

References 27 publications

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“…Durability of jute geotextile, which also is lignocellulosic, in a compost environment was found to reduce to 72 % after 90 days [12]. Tensile strength of coir fibres derived from coir geotextile samples which were exposed to natural rainfall and sunlight in tropical climate of eastern Brazil were found to lose 77 % of original strength after one year [13].…”

Section: Introductionmentioning

confidence: 98%

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Sumi¹,

Unnikrishnan²,

Mathew³

2016

Int. J. of Geosynth. and Ground Eng.

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Results of detailed experimental studies carried out to investigate the resistance of coir geotextiles modified using cashew nut shell liquid (CNSL) to attack of biological organisms are reported. A mixed spore suspension composed of four fungal stains, Chaetomium indicum, Curvularia lunata, Aspergillus fumigatus and Penicillium rubrum was used to study microbial susceptibility of coir geotextiles in humid warm atmosphere. Soil burial studies were carried out under controlled conditions for a period of 240 days to learn the behaviour of geotextiles in contact with specially prepared soil containing a variety of microorganisms. A field study was carried out to investigate the behaviour of coir geotextiles in subterranean termite mounds. The improved properties of modified coir geotextiles were substantiated on the basis of weight loss, moisture absorption, tensile strength and surface morphology. The results show that biological resistance of coir geotextiles was greatly improved by modification with CNSL. Tensile strength of unmodified samples reduced to 19 % whereas modified geotextiles retained 76 % of the initial tensile strength at the end of 240 days of soil burial. SEM images affirm that modification of coir with CNSL obtained in the present work could close the pores on fibre surface and delay biological degradation considerably.

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Section: Introductionmentioning

confidence: 98%

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Sumi¹,

Unnikrishnan²,

Mathew³

2016

Int. J. of Geosynth. and Ground Eng.

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“…biological, chemical, mechanical, thermal, photochemical and aqueous), depending on individual constituents. For instance, lignin is mainly responsible for UV and fire degradation, whereas, hemicelluloses are responsible for biological degradation, thermal degradation and high moisture absorption [10,11]. Physical properties include: fiber dimensions, defects, strength and structure.…”

Section: Natural Fibersmentioning

confidence: 99%

“…However, this model does not predict the elastic modulus of hybrid composite reinforced with discontinuous fibers and small particles. Essabir et al [96] applied Tsai-Pagano equation (shown in Equation (11)) to predict the elastic modulus of polypropylene hybrid composites reinforced with core fibers and core shell particles: (11) where E 1 and E 2 are elastic moduli of the composite reinforced with core shell particles and core fibers, respectively. Similar to ROM, Tsai-Pagano theory assumes that there is a good dispersion, distribution and alignment of fibers, interfacial adhesion between reinforcements and polymer matrix.…”

Section: Matrix Reinforcement Processing Techniquementioning

confidence: 99%

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Recent progress on natural fiber hybrid composites for advanced applications: A review

Mochane¹,

Mokhena²,

Mokhothu³

et al. 2019

Express Polym. Lett.

305

151

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Natural fibers, as replacement of engineered fibers, have been one of the most researched topics over the past years. This is due to their inherent properties, such as biodegradability, renewability and their abundant availability when compared to synthetic fibers. Synthetic fibers derived from finite resources (fossil fuels) and are thus, affected mainly by volatility oil prices and their accumulation in the environment and/or landfill sites as main drawbacks their mechanical properties and thermal properties surpass that of natural fibers. A combination of these fibers/fillers, as reinforcement of various polymeric materials, offers new opportunities to produce multifunctional materials and structures for advanced applications. This article intends to cover recent developments from 2013-up to date on hybrid composites, based on natural fibers with other fillers. Hybrid composites preparation and characterization towards their applicability in advanced applications and the current challenges are also presented.

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“…Therefore, improving the mechanical performance of cellulosic materials of coir fibres using a facile approach attracts many researchers [19][20][21][22][23][24][25]. In this study, coir fibres were chemically treated by quick precipitation method.…”

Section: Introductionmentioning

confidence: 99%

Performance of Chemically Treated Natural Fibres and Lime in Soft Soil for the Utilisation as Pile-Supported Earth Platform

Anggraini

Asadi

Huat

et al. 2015

Int. J. of Geosynth. and Ground Eng.

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This work presents the effect of lime and treated coir fibre on the mechanical behaviour of soft clay soil as a pile-supported earth platform. The experimental programme comprised three types of test (flexural strength, indirect tensile strength and triaxial compression strength). Experimental results were used in a numerical analysis in order to observe the performance of the treated soil as a load-transfer base layer depending on the height of the earth platform and the material properties of the treated soil. Two-dimensional physical model experiments were performed to validate the numerical model of the pilesupported load transfer platform. The numerical analyses showed the importance of the mechanical properties of the treated soils for the efficacy and effectiveness of the reduction of the settlement of the earth platform, as well as to enhance the bending performance of the earth platform. The efficacy of limed soil reinforced with chemically treated coir fibres is up to 30 % under various loadings of structures when the effective height of the earth platform is 0.3 m. The differential settlement at the elevation of the pile head is significantly reduced by up to 100 %. Present study concluded that this treatment technique can not only increase the mechanical performance of the coir fibres and lime-reinforced soil, but can also improve the interfacial mechanical interactions between the coir fibre surface and the soil particles, resulting in higher performance of the composites used as a pile-supported earth platform. KeywordsNatural fibre Á Lime Á Mechanical properties Á Numerical analysis Á Physical model Á Pile-supported earth platform List of symbols c 0 Cohesion (kPa) E Efficacy (%) ø 0 Effective internal friction (°) m Poisson ratio (dimensionless) P o The uniform pressure on geotextile (kPa) r s Pressure of soft soil ground midway between the pile heads (kPa) D Mid span deflection of earth platform (mm) E s Young's modulus of soft soil (kPa), H s Original thickness of soft soil (mm) H Height of earth platform (m) c s Unit weight of soil (kN/m 3 ) s Spacing between pile head (m) bDiameter of pile (m) qSurcharge load (kPa)

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Effects of the climatic conditions of the southeastern Brazil on degradation the fibers of coir-geotextile: Evaluation of mechanical and structural properties

Cited by 42 publications

References 27 publications

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Experimental Investigations on Biological Resistance of Surface Modified Coir Geotextiles

Recent progress on natural fiber hybrid composites for advanced applications: A review

Performance of Chemically Treated Natural Fibres and Lime in Soft Soil for the Utilisation as Pile-Supported Earth Platform

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